William h



(NoModel.) W. H. PICKETT.

CHAIN PIPE WRENCH.

Patented Septl 29, 1896.

UNITED STATES VILLIAM II. PICKETT, OF WARREN, PENNSYLVANIA, ASSIGNOR, BY MESNE- PATENT @Erica ASSIGNMENTS, TO MARY ELIZABETH PICKETT, OF SAME PLACE.

CHAIN PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 568,697, dated September 29, 1896. Application filed Pebruaryl, 1896. Serial No. 578,027. (No model.)

To all whom, t may concern:

Be it known that I, WILLIAM H. Prcxnrr, a citizen of the United States, residing at Varren, in the county of Warren and State of Pennsylvania, have invented new and useful Improvements in Chain Pipe-Wrenches, of which the following is a specication.

This invention relates to pipe-wrenches designed for screwing and unscrewing pipes of varying diameter.

The object of my invention is to provide a novel, simple, efficient, and economical adjustable chain pipe-wrench, which is strong, substantial, and durable and can be used on pipes of widely different diameter, and will entirely avoid crushing the pipes when rotating them and will not become so fastened to a pipe as to render it difficult or inconvenient to remove the wrench when the pipe has been screwed into orunscrewed from position.

To accomplish this object, my invention consists in apipe-Wrench composed of a handle-bar having on opposite sides of one end a longitudinal chain guide channel constructed with side claws and a pipe-gripping jaw having two sets of teeth pointing in different directions from the central part thereof, an adjustable bolt extending transversely through the handle-bar in juxtaposition to the toothed gripping-jaw and the chain-guide channel, and a chain connected at one end with the bolt adapted to extend along the toothed gripping-jaw and around one end of the handle-bar into the chain-guide channel and provided withlateral studs to engage the notches or claws at the sides of said channel.

The invention also consists in other features of construction and combination or arrangement of parts hereinafter described and claimed, reference being made to the accompanying drawings, in which- Figure 1 is a perspective view of a chain pipe-wrench constructed in accordance with my invention. Fig. 2 is a longitudinal sectional side elevation of the same, showing the parts in the position they occupy when acting on a pipe. Fig. 3 is a detail transverse sectional view taken centrally through the toothed gripping-jaw, and Fig. 4 is a detail perspective view of the pipe-gripping jaw.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawings, wherein-- The numeral 1 indicates the handle-bar, which is preterabljT composed entirely of metal, and is formed integral at what may be termed the front end with an enlarged or somewhat widened head 2, having in one side and extending along the length of the head at an angle of slight inclination to the longitudinal axis of the handle a dovetailed recess 3, into which is tted a dovetailed pipegripping jaw 4, having a convex face constructed with two sets of teeth, as at 5 and G. These two sets of teeth point in different directions from the center of the jaw, or rather from a point midway between the ends of the jaw, and the latter is composed of steel with the points of the teeth sharpened to bite and engage the periphery of the pipe which is to be rotated or turned. The enlarged head is provided with a curved front end 7, and in the side opposite the pipe-gripping jaw 4 is formed a longitudinal chainguide channel 8, having the side walls 9 arranged parallel with each other and constructed with three or more claws 10, with which lateral studs on the chain, hereinafter explained, are adapted to be engaged to hold the chain upon a pipe interposed between the chain and the pipe-gripping jaw, as will more fully hereinafter app-ear.

The bottom wall of the chain-guide channel 8 runs at an angle of inclination to the bottom of the recess 3, and the pipe-holding chain, which is composed of a large number of links 12, pivotally connected by pivot-pins, as at 13, is adapted to lie in the chain-guide channel, so that the side walls 9 effectually hold the chain against lateral displacement from the enlarged head of the handle-bar.

The rear end of the enlarged head2 is .constructed with a transverse orifice 14 of a tapering form, and adapted to receive an adjusting-bolt 15, which can oscillate forward and backward in the orifice 14, while the adjusting thumb-nut 16 of the bolt rests against the outer end portion of the enlargement or swell 17, which constitutes a thumb-nut rest and forms a part of the handle-bar and its head. The bolt 15 is provided at one end with a IOO screw-threaded port-ion 1S with which the thumb-nut 1G engages, while the opposite end of the bolt is bifurcated to receive one end of the link chain which is pivoted in the bifurcated end of the bolt through the medium of a pivot-pin, as at 19. The chain-links composing the other end portion of the chain are constructed with laterally -projeeting studs 20, adapted to enter into engagement with the claws l0, forming a part of the side walls 9 of the chain-guide channel 8. Any suitable number of links may be provided with lateral studs, as at 20, but it is unnecessary to provide all the links of the chain with studs, because the chain is intended to encircle a pipe of greater or less diameter, and that portion of the chain which encircles the pipe and which extends around the curved front end 7 of the enlarged head 2 does not require to be furnished with studs to engage the claws.

The toothed gripping-jaw i is designed to be removable and replaceable, so that it can be detached for sharpening the teeth thereof and to enable a new gripping-jaw to be easily substituted therefor whenever occasion demands. The gripping-jaw, as before stated, is dovetailed into the recess in one side of the enlarged head of the handle-bar, and it can be held against accidental displacement through the inediu in of a inetal screw 2l, which is inserted from the chain-guide channel through the enlarged head and is screwed into the gripping-jaw. It will be obvious that the screw is readily accessible and can be easily unscrewed whenever it is desirable to detach or remove the gripping-jaw. The toothed outer face of the gripping-jaw runs in a curved line in such manner that the face of the jaw is convex, the highest part being at the center and the lowest parts at the ends. The convex gripping-jaw, with its two sets of biting-teeth pointing in opposite directions from the central part of the jaw, are important and advantageous features of my invention in that, if a pipe is to be rotated or turned in one direction, the front set of teeth G are engaged with the pipe and the handlebar is raised up, whereas if the pipe is to be rotated or turned in the opposite direction the pipe is engaged with the rear side of the teeth 5 and the handle-bar is depressed or forced downward. This manner of using the wrench is very advantageous, because it is more convenient and saves considerable time to employ the wrench on the top of the pipe rather than on the under side thereof, and, furthermore, any tendency of the pipe to roll up on the highest part of the gripping-jaw causes the pipe to be more iirmly held. I lind that in my construction the pipe does not become so fastened or engaged with the teeth of the Ijaw as to render it dilhcult and inconvenient to remove the wrench when required.

The outer end of the elevated thumb-nut rest 17 is countersunk or formed with a concavity 22, and the under side of the thumbnut is constructed with a convex bearing 23, adapted to lit and oseillate or rock in the countersink or concavity 22, for the purpose of obtaining a nice fit and a correct action of the parts when the bolt l5 is oscillated forward or backward in the orifice 11i. rlhe eountersink or eoncavity 22 and the convex bearing 23 also serve to center the threaded extremity of the bolt and prevent the threads from becoming worn or jammed by Contact with the walls of the orifice l-i.

The purpose of the adjusting-bolt l5 is to tighten the chain on the pipe after the chain has been applied around the pipe and engaged with the claws. If the chain is not adj ustable in the manner described, it will not always tightly engage the pipe when the studs of the chain pass into the claws, and as these studs are some distance apart the adjustment of the ehain through the medium of the studs will not secure the required tightness of the chain on the pipe, in consequence of which the pipe will roll toward one end of the ordinary toothed jaw used in this class of wrenches, which is objectionable, owing to the danger of crushing the pipe. Further, the toothed jaw will so fasten onto the pipe as to render it difficult and inconvenient to remove the wrench when desired. The adjustablc bolt, however, enables the chain to be tightened from the minimum to the maximum adjustment with great accu raey, as will be obvious, and the chain can therefore be made to tightly bind pipes of widely different diameter.

Having thus described my invention, what I claim isl. A chain pipe-wrench, consisting of a handle-bar formed integral at one end with an enlarged head constructed with a transverse bolt-oriiice and provided along one side with a chain guide channel having side notches or claws, a removable and replaceable convex gripping-jaw seated in the opposite side of the said head and having its end portions constructed with two sets oi' teeth pointing in different directions from the highest central part of said convex jaw, an adj Listingbolt arranged in the bolt-orifice and having a nut, and a chain having one end secured to the bolt, and the other end provided with studs to engage the side notches or claws of the chain-guide channel, substantially as described.

2. A chain pipe-wrench, consisting of a handle-bar having at one end an enlarged head constructed with a transverse bolt-orilice and provided in one side with a dovetailed recess, and in the opposite side with a chainguide channel having side notches or claws, a removable and replaceable convex gripping-j aw seated in said dovetailed recess and having its end portions constructed with two sets of teeth pointing in different directions from the highest central part of said convex IOO IIO

jaw, an adjusting-bolt arranged in said boltoriiice and having a thumb-nut, and a linkchain pivoted at y one end to said bolt and provided with studs to engage the side notches or claws of the chainguide channel', substantially as described.

3. The combination in a chain pipe-wrench', of a handle-bar having a transverse oriiice 14, a countersunk or concaved nut-rest 17, an oscillatory adjusting-bolt 15 arranged in the said orifice, a gripping-jaw 4, a link chain pivoted to the bolt and having means to engage the head of the handle-bar, and a nut 16 adjustable on the bolt and having a convex bearing 23 adapted to oscillate in the countersink or concave of the nut-rest, substantially as described. A

4. The combination in a chain pipe-wrench, of a handle-bar having a head and a tapering transverse bolt-orifice 14, a countersunk or concaved nut-rest 17, the oscillatory adjustable bolt 15 arranged in the bolt-orifice, a thumb-nut 16 engaging the bolt and havinga convex bearing 23 seated and rocking in the countersink or concave of the nut-rest, the removable and replaceable convex grippingjaw constructed with two sets of teeth pointing in diierent directions from the highest central part of said convex jaw, and a link thumb-nut 16 engaging the bolt and havinga convex bearing 23 seated and rocking in the countersink or concave of the nut-rest, the chain-guide channel 8 formed along one side of the head and having side notches or claws 10, the removable and replaceable convex gripping-j aw 4 seated in the opposite side of o the head and having its ends constructed with two sets of teeth pointing in different directions from the highest central part of said convex jaw, and a link chain pivoted to the adjusting-bolt and having lateral studs 20 to engage the side notches or claws of the chainguide channel, substantially as described.

6. A chain pipe-Wrench, consisting of a handle-bar having an enlarged head provided with a transverse tapering bolt-orifice 14, a countersunk or concaved nut-rest 17, a dovetailed recess 3 in one side, and a chain-guide channel 8 in the opposite side, an oscillatory adj usting-bolt 15 arranged in the bolt-oriiice, a thumb-nut 16 engaging the bolt and provided With a convex bearing 23 seated and rocking in the countersink or concave of the nut-rest, a removable and replaceable convex gripping-jaw 4 arranged in the dovetailed recess of the head and constructed with two sets of teeth pointing in different directions from the highest central part of said jaw, and a link chain pivoted to said bolt and provided with means for adjustably engaging the side of the head containing the chain-guide channel, substantially as described.

7. The combination in a chain pipe-Wrench, of a handle-bar having a transverse bolt-orice 14, a countersunk or concaved nut-rest 17, a dovetailed recess 3 formed in one side, and a longitudinal chain-guide channel S formed in the opposite side and having its side walls provided with notches or claws 10, a dovetailed gripping-jaw 4 tting the dovetailed recess and constructed with teeth for engaging a pipe, a device for detachably securing the gripping-jaw, an adjusting-bolt 15 extending through the bolt-orifice,a thumbnut 16 engaging the bolt and provided with a convex bearing 23 itting and rocking in the countersink or concave of thek nut-rest, and a link chain pivoted to one end of the bolt and provided with lateral studs 2O for engaging the notches or claws at the sides of the chain-guide channel, substantially as de- WILLIAM H. PIoKETT.

Witnesses: A

E. H. TRUsHEL, THOs. WHITE. 

